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1st January 2022, 03:33 PM #16
I’ve produced male and female M30 threads by hand in EN58 stainless; somewhat hard going but certainly not beyond the ability of the average built male. And I always drill for tapping to the recommended drill size (26.5mm for M30). But this was done using quality European drills, taps and dies. When I came to Oz nearly 20 years ago I quickly found my rather well-used tooling urinated from a great height all over the P&N and Sutton tools I was expected to teach with and use. When a standard Dormer HSS jobber drill will drill out a 316 grade 8.8 bolt that has already blunted two brand new Sutton Viper cobalt drill bits you start to wonder what they made them from….
Nothing succeeds like a budgie without a beak.
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1st January 2022 03:33 PM # ADSGoogle Adsense Advertisement
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1st January 2022, 06:25 PM #17GOLD MEMBER
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1st January 2022, 07:06 PM #18
My error in naming them “Vipers”. They were definitely the Sutton cobalts, purple boxed set SM2. Fortunately I didn’t purchase them; I ordered them for my workshop. The bits were blunted by (again) over-zealous Marine Techs who thankfully stopped at two before calling me in to de-fornicate their errors.
Interestingly; I just found a Sutton “press release” from 2016 where they were spruiking that their HSS now came from Europe…. Independent testing shows Sutton Tools’ Viper Plus and INOX drill bits are class leaders | Sutton Tools My comparison definitely pre-dates this by a decade.Nothing succeeds like a budgie without a beak.
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1st January 2022, 07:43 PM #19Intermediate Member
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1st January 2022, 07:47 PM #20Intermediate Member
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I have the sutton heavy duty m35 cobalt bits and haven't had issue. It the one in purple container. Just want to keep them for harder material and use new set for most others.
Those inox bits by suttons i heard are not too bad.
Back in my mining engineering days we used suttons on a makita drill.
Now i do other stuff
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1st January 2022, 08:18 PM #21GOLD MEMBER
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Me either. I think they are superb. They would certainly eat a 316 bolt for breakfast.
Cheif Tiff has admitted that the two Sutton drill bits were blunted by the Techs. In that case it's very misleading for him to compare them unfavourably with his Dormer bits. A Sutton cobalt bit, used correctly, will drill 316 all day.
BTW, can you even get a grade 8.8 bolt in 316? I think 316 would be a grade A4 bolt.
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1st January 2022, 08:39 PM #22Intermediate Member
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1st January 2022, 09:25 PM #23SENIOR MEMBER
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1st January 2022, 09:38 PM #24Intermediate Member
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2nd January 2022, 08:52 AM #25
Yes; A4 only refers to the material, 8.8 refers to the tensile and yield strengths. Normal high tensile 316SS are marked A4-80 but there are applications that require 8.8 high tensile with A4 corrosion resistance or low magnetic signature. Hobson Bumax bolts are an example.
Nothing succeeds like a budgie without a beak.
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2nd January 2022, 09:23 AM #26.
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A lot of people blame tools for their problems.
At the mens shed the supervisor asked me if I would source some bits for use by members on difficult steels like stainless. I bought some M42 (Cobalt) bits from ebay as I had previously used these successfully myself on a project that involved 12mm thick Bisalloy plates.
A week or so later (I was not there) one of the members tried using a DP to drill some stainless with a regular HSS bit and ran into trouble. After gnawing away at it for a while he approached the supervisor who said"'use one of Bobs bits and use very high pressure", but the member managed somehow to do this.
It's hard to see, but this bit has a galled cap of SS sitting on the end. When I went in for my weekly visit the supervisor complained to me that I had purchased dodgy bits.
I tried to find the member who was using the bit but he was not around - however I knew which bench drill press he was using and the speed is never changed on that DP and when I check it was still at ~1000 rpm.
I took an offcuts of the same stainless steel the member had been trying to drill, the bent bit and another new bit the same size home and tried the new bit on some 6mm SS myself using 400 rpm.
Absolutely no problem. Labeled N are the two holes drilled with the new bit.
I cut the bend off the old bit, reground the tip and drilled the two holes marked "O"
In this photo you can see the galled SS cap on the end of the cut off bit tip.
I then proceeded to drill about 20 holes with the shortened bit.
I emailed the member and supervisor with the above photo and the member confirmed the use of high rpms - he thought it would cut better and he also confirmed the bit was eventually glowing yellow hot.
What had happened is that using the HSS (probably blunt bit) first, work hardened the SS so much that even the M42 bit would not cut through it. The said member had continued to gnaw on the same hole and of course he ran into trouble. The solution then if the same hole was to be drilled out would have been to use a carbide bit.
The supervisor is a former metal work teacher and should have know this but as usual he was probably busy and did not follow up on exactly what had happened.
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2nd January 2022, 11:36 AM #27GOLD MEMBER
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You must have the patience of a saint to work in a men's shed Bob. I think I'd lose it.
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2nd January 2022, 01:31 PM #28.
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2nd January 2022, 01:34 PM #29Taking a break
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2nd January 2022, 03:15 PM #30
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